The Chassam Sofer also references the possuk quoted before, ולא היה כקרח וכעדתו כאשר דבר ה' ביד משה. He explains how sometimes well-meaning but misguided individuals inadvertently get involved in machlokes. They claim that the cause for which they are fighting is an extremely important one, and it is actually a mitzvah to involve oneself with it. They quote halachos and pesukim to support their stance. They say כאשר דבר ה' ביד משה in fact this is what Hashem commanded Moshe in the Torah and 'I am obligated to fight for this cause'. This is how they become involved in the conflagration of machlokes. He cautions us, 'you should not be like Korach and his people, saying that you are fighting because this is what Hashem commanded you to do'.
One should be extremely careful not to involve himself at all in any aspect of a quarrel or conflict, he should not offer an opinion or align himself with any of the warring factions. There is never a justification, and the effects are always damaging.